CN209911216U - Miniature solution pH detection device based on spectral analysis - Google Patents
Miniature solution pH detection device based on spectral analysis Download PDFInfo
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- CN209911216U CN209911216U CN201920245159.8U CN201920245159U CN209911216U CN 209911216 U CN209911216 U CN 209911216U CN 201920245159 U CN201920245159 U CN 201920245159U CN 209911216 U CN209911216 U CN 209911216U
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- 238000001514 detection method Methods 0.000 title claims abstract description 17
- 238000010183 spectrum analysis Methods 0.000 title claims abstract description 9
- 238000005070 sampling Methods 0.000 claims abstract description 43
- 230000002572 peristaltic effect Effects 0.000 claims abstract description 14
- 239000012488 sample solution Substances 0.000 claims abstract description 8
- 230000005540 biological transmission Effects 0.000 claims description 11
- 239000011521 glass Substances 0.000 claims description 11
- 230000003287 optical effect Effects 0.000 claims description 9
- 239000012528 membrane Substances 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 239000013307 optical fiber Substances 0.000 claims description 6
- 239000003292 glue Substances 0.000 claims description 5
- 229910052736 halogen Inorganic materials 0.000 claims description 3
- 230000007935 neutral effect Effects 0.000 claims description 3
- 229910052721 tungsten Inorganic materials 0.000 claims description 3
- 239000010937 tungsten Substances 0.000 claims description 3
- 238000004611 spectroscopical analysis Methods 0.000 claims 4
- 150000002367 halogens Chemical class 0.000 claims 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims 1
- 238000001228 spectrum Methods 0.000 abstract description 15
- 239000000835 fiber Substances 0.000 abstract description 11
- 230000004044 response Effects 0.000 abstract description 4
- 230000008901 benefit Effects 0.000 abstract description 3
- 230000003595 spectral effect Effects 0.000 abstract description 2
- 239000000243 solution Substances 0.000 description 27
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 8
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 8
- 230000008859 change Effects 0.000 description 8
- 238000003756 stirring Methods 0.000 description 6
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 description 4
- UDSAIICHUKSCKT-UHFFFAOYSA-N bromophenol blue Chemical compound C1=C(Br)C(O)=C(Br)C=C1C1(C=2C=C(Br)C(O)=C(Br)C=2)C2=CC=CC=C2S(=O)(=O)O1 UDSAIICHUKSCKT-UHFFFAOYSA-N 0.000 description 4
- 229920002301 cellulose acetate Polymers 0.000 description 4
- WWAABJGNHFGXSJ-UHFFFAOYSA-N chlorophenol red Chemical compound C1=C(Cl)C(O)=CC=C1C1(C=2C=C(Cl)C(O)=CC=2)C2=CC=CC=C2S(=O)(=O)O1 WWAABJGNHFGXSJ-UHFFFAOYSA-N 0.000 description 4
- IQFVPQOLBLOTPF-HKXUKFGYSA-L congo red Chemical compound [Na+].[Na+].C1=CC=CC2=C(N)C(/N=N/C3=CC=C(C=C3)C3=CC=C(C=C3)/N=N/C3=C(C4=CC=CC=C4C(=C3)S([O-])(=O)=O)N)=CC(S([O-])(=O)=O)=C21 IQFVPQOLBLOTPF-HKXUKFGYSA-L 0.000 description 4
- OBRMNDMBJQTZHV-UHFFFAOYSA-N cresol red Chemical compound C1=C(O)C(C)=CC(C2(C3=CC=CC=C3S(=O)(=O)O2)C=2C=C(C)C(O)=CC=2)=C1 OBRMNDMBJQTZHV-UHFFFAOYSA-N 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 239000011259 mixed solution Substances 0.000 description 4
- 239000002243 precursor Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 3
- -1 hydrogen ions Chemical class 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- 238000007605 air drying Methods 0.000 description 2
- 239000008367 deionised water Substances 0.000 description 2
- 229910021641 deionized water Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 235000019441 ethanol Nutrition 0.000 description 2
- 238000005187 foaming Methods 0.000 description 2
- 238000009776 industrial production Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000000862 absorption spectrum Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000007793 ph indicator Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 238000012549 training Methods 0.000 description 1
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Abstract
The utility model discloses a miniature solution pH detection device based on spectral analysis, including light source, optic fibre, miniature sampling device, peristaltic pump, spectrum appearance, temperature sensor, controller, the light source is connected with miniature sampling device through optic fibre, miniature sampling device is connected with the spectrum appearance through optic fibre, the peristaltic pump passes through pipe connection between miniature sampling device and the sample solution that awaits measuring, the controller is connected with spectrum appearance and temperature sensor respectively. The utility model provides a miniature solution pH sampling device through analysis spectral information, predicts solution pH value to reach the purpose that detects solution pH value, solved internal pH on-line measuring's problem, the device has working range big, changes advantage such as response is rapid to external pH value.
Description
Technical Field
The utility model relates to a pH detects technical field, specifically is a miniature solution pH detection device based on spectral analysis.
Background
The pH is a measure of the concentration of hydrogen ions in the solution, which is known as a measure of the pH of the solution. In applications in the environmental, industrial, pharmaceutical and food industries, pH is a very important parameter. For example, in environmental protection, pH is an important indicator for controlling the discharge of sewage and industrial wastewater. In the industrial production process, the pH can affect the industrial production process and can directly affect the quality of a final product, so that the continuous online monitoring of the pH value is very important, the difficulty in measuring and controlling the pH value is high, and the method is one of the most difficult single-dimensional measurement and control problems.
For example, patent No. 201520602905.6, "pH value rapid online detection device based on absorption spectrum", although it can rapidly detect the pH value of electrolyte aqueous solution online, and can track the pH change of solution in real time, so as to realize continuous online monitoring. However, in this method, the optical pH sensor uses a single pH indicator to measure the pH value of the solution by detecting the change of an optical parameter of the solution, and this method is greatly affected by environmental factors during use and has a limited measurement range and precision.
In order to solve the problems, the scheme is developed accordingly.
SUMMERY OF THE UTILITY MODEL
Technical problem to be solved
An object of the utility model is to overcome prior art's is not enough, it is big to provide one kind, changes the response rapidly to external pH value, and receives to influence less miniature solution pH detection device based on spectral analysis.
(II) technical scheme
In order to achieve the above purpose, the utility model discloses a following technical scheme realizes: the utility model provides a miniature solution pH detection device based on spectral analysis, includes the light source, optic fibre, miniature sampling device, peristaltic pump, spectrum appearance, temperature sensor, controller, the light source pass through optic fibre with miniature sampling device is connected, miniature sampling device pass through optic fibre with the spectrum appearance is connected, the peristaltic pump pass through pipe connection in between miniature sampling device and the sample solution that awaits measuring, the controller respectively with the spectrum appearance with temperature sensor is connected.
A sampling channel and a light path transmission channel through which a sample solution to be detected passes are arranged in the micro sampling device; the optical path transmission device is characterized in that a sensitive film is attached to the sampling channel, an inlet and an outlet of the sampling channel are symmetrically arranged relative to the central axis of the sensitive film at an included angle of 90 degrees, and the central line of the optical path transmission channel is overlapped with the central axis of the sensitive film.
Preferably, the sensitive membrane is adhered to the glass sheet by neutral waterproof glue, and the glass sheet is adhered to the reaction cavity of the sampling device.
Preferably, the diameter of the sampling channel and the optical path transmission channel is 1.8-2.5 mm.
Preferably, the light source is a tungsten halogen lamp.
Preferably, the controller adopts an AM3354 chip.
Preferably, the spectrometer is a USB2000+ spectrometer.
The preparation process of the sensitive membrane of the scheme is as follows
(1) Dissolving a proper amount of cellulose acetate in DMF, fully stirring, placing in an ultrasonic cleaner, oscillating for 2min, and then placing the solution on a magnetic stirrer, and continuously stirring for 5h at 60 ℃;
(2) preparing a mixed solution (precursor) of tetraethoxysilane, absolute ethyl alcohol, hydrochloric acid and deionized water with a proper volume and a fixed molar ratio;
(3) mixing the two solutions, adding a proper amount of four indicators, namely Congo red, bromophenol blue, cresol red and chlorophenol red, and placing the mixed solution in an ultrasonic cleaner to oscillate for 5min until the indicators are completely dissolved;
(4) continuously stirring the solution obtained in the step (3) on a magnetic stirrer at 50 ℃ until a uniform and transparent sol solution is formed, standing the sol solution for 12 hours, and carrying out foaming and aging treatment;
(5) pouring the sol solution into a sampling device, uniformly smearing, and drying in a forced air drying oven at 70 ℃ in vacuum to obtain the sensitive membrane attached to the sampling device.
The preparation process comprises the following steps of: 0.1g of cellulose acetate, 8g of mixed indicator (2 g each of congo red, bromophenol blue, cresol red and chlorophenol red), 15ml of DMF, 50ul (0.01mol/L) of hydrochloric acid, and 7.5ml of precursor (water: ethyl orthosilicate: ethanol molar ratio 4:1: 2).
(III) advantageous effects
After the technical scheme is adopted, compared with the prior art, the utility model, possess following advantage:
1. the pH value of the solution is predicted by analyzing the spectral information, so that the aim of detecting the pH value of the solution is fulfilled, the problem of on-line detection of the pH value in China is solved, and the device has the advantages of large working range, quick response to the change of the pH value outside and the like.
2. The inlet and the outlet of the sampling channel form a 90-degree included angle and are symmetrically arranged relative to the central axis of the sensitive film, the central line of the light path transmission channel is superposed with the central axis of the sensitive film, the liquid to be detected is well guaranteed to be fully contacted with the sensitive film, the color display speed can be accelerated to a certain degree, and the measurement precision, the repeatability, the stability and the response time are greatly improved.
Drawings
FIG. 1 is a block diagram of the detecting device of the present invention;
fig. 2 is a schematic structural diagram of the micro sampling device of the present invention.
In the figure: the device comprises a light source 1, a miniature sampling device 2, a spectrometer 3, a temperature sensor 4, a controller 5, a peristaltic pump 6, a peristaltic pump inlet 11, a peristaltic pump outlet 12, an optical fiber inlet connection 13, an optical fiber outlet connection 14, a sensitive membrane 15, a glass sheet 16, a reaction cavity 17, a sampling channel 18 and an optical path transmission channel 19.
Detailed Description
The invention is explained in more detail below with reference to the figures and examples.
As shown in fig. 1-2: the utility model provides a miniature solution pH detection device based on spectral analysis, includes light source 1, optic fibre, miniature sampling device 2, peristaltic pump 6, spectrum appearance 3, temperature sensor 4, controller 5, and light source 1 is connected with miniature sampling device 2 through optic fibre, and miniature sampling device 2 is connected with spectrum appearance 3 through optic fibre, and peristaltic pump 6 passes through pipe connection between miniature sampling device 2 and the sample solution that awaits measuring, and controller 5 is connected with spectrum appearance 3 and temperature sensor 4 respectively.
The micro sampling device 2 is provided with a sampling channel 18 through which a sample solution to be detected passes, the sampling channel 18 is attached with a sensitive film 15, the color of the sensitive film 15 can be changed along with the change of the pH value of the liquid to be detected, and the inlet and the outlet of the sampling channel 18 form 90-degree included angles and are symmetrically arranged relative to the central axis of the sensitive film 15, so that the liquid to be detected is well ensured to be fully contacted with the sensitive film 15, the color display speed can be accelerated to a certain degree, and the color display is more accurate. The central line of the light path transmission channel 19 is superposed with the central axis of the sensitive film 15, so that the light path is vertically contacted with the sensitive film 15.
The sensitive film 15 can change color along with the change of the pH value of the solution, the thickness of the glass sheet 16 is 0.8mm, the diameter of the glass sheet is 8mm, the micro sampling device 2 is formed by splicing a large head and a small head, a reaction cavity 17 is formed at the splicing position of the large head and the small head, the glass sheet 16 is arranged in the reaction cavity 17, and the reaction cavity 17 is a cylindrical cavity with the diameter of 6mm and the height of 4 mm.
The large head is provided with a peristaltic pump inlet 11, a peristaltic pump outlet 12 and an optical fiber inlet connection 13, the small head is provided with an optical fiber outlet connection 14, and the liquid to be detected enters into the contact with the sensitive membrane 15 through the peristaltic pump inlet 11 and is discharged from the peristaltic pump outlet 12. Light entering the fiber inlet connection 13, after passing through the sensitive film 15, can change color with the change of the pH of the solution, and is transmitted out of the fiber outlet connection 14 and received by the spectrometer 3.
After the light path of the light entering the spectrum sampling device passes through the action of the sensitive film 15, the light path is transmitted out by the optical fiber and received by the spectrometer 3, the spectrometer 3 transmits the spectrum data to the ARM controller 5, and the ARM controller 5 receives the signal from the temperature sensor 4 at the same time. The ARM controller 5 can obtain the pH value of the sample solution to be detected according to the signal of the temperature sensor 4 and the spectrum data of the spectrometer 3.
The spectrum information obtained by the spectrum acquisition device is used for training and predicting the pH spectrum model, and experimental results show that the measurement precision of the device is 0.1pH, and the device has better stability and repeatability compared with the traditional pH glass electrode.
The diameters of the sampling channel 18 and the optical path transmission channel 19 are 1.8-2.5mm, the channel diameters in the range have higher detection progress to a certain extent, and according to the realization, the detection progress is faster compared with the pipeline diameter at 2 mm.
The sensitive film 15 is adhered to a glass sheet 16 through neutral waterproof glue, and the glass sheet 16 is adhered to a reaction cavity 17 of the sampling device. GLE-10 glue is adopted as glue.
The sensitive film 15 is prepared as follows
1. Dissolving a proper amount of cellulose acetate in DMF, fully stirring, placing in an ultrasonic cleaner, oscillating for 2min, and then placing the solution on a magnetic stirrer, and continuously stirring for 5h at 60 ℃.
2. Preparing a mixed solution (precursor) of tetraethoxysilane, absolute ethyl alcohol, hydrochloric acid and deionized water with a proper volume and a fixed molar ratio.
3. Mixing the two solutions, adding a proper amount of four indicators of Congo red, bromophenol blue, cresol red and chlorophenol red, and placing the mixed solution in an ultrasonic cleaner to oscillate for 5min until the indicators are completely dissolved.
4. And (3) continuously stirring the solution obtained in the step (3) on a magnetic stirrer at 50 ℃ until a uniform and transparent sol solution is formed, and standing the sol solution for 12 hours for foaming and aging treatment.
5. And pouring the sol solution into a sampling device, uniformly smearing, and drying in a forced air drying oven at 70 ℃ in vacuum to obtain the sensitive membrane 15 attached to the sampling device.
The preparation process comprises the following steps of: 0.1g of cellulose acetate, 8g of mixed indicator (2 g each of congo red, bromophenol blue, cresol red and chlorophenol red), 15ml of DMF, 50ul (0.01mol/L) of hydrochloric acid, and 7.5ml of precursor (water: ethyl orthosilicate: ethanol molar ratio 4:1: 2).
The light source 1 is a tungsten halogen lamp. The controller 5 employs an AM3354 chip. Spectrometer 3 model is USB2000+ spectrometer 3, the manufacturer is american ocean optics corporation.
The utility model discloses a miniature solution pH detection device based on spectral analysis, the various functional module and the structure that adopt are existing hardware products among the prior art, do not relate to the improvement to the software method.
In light of the foregoing, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and the scope of protection must be determined by the scope of claims.
Claims (5)
1. The utility model provides a miniature solution pH detection device based on spectral analysis which characterized in that: the micro sampling device is connected with the spectrograph through the optical fiber, the peristaltic pump is connected between the micro sampling device and a sample solution to be detected through a conduit, and the controller is respectively connected with the spectrograph and the temperature sensor;
a sampling channel and a light path transmission channel through which a sample solution to be detected passes are arranged in the micro sampling device; the sampling channel is attached with a sensitive membrane, and an inlet and an outlet of the sampling channel are symmetrically arranged around the central axis of the sensitive membrane at an included angle of 90 degrees; the central line of the optical path transmission channel is coincident with the central axis of the sensitive film, the sensitive film is adhered to the glass sheet through neutral waterproof glue, and the glass sheet is adhered to the reaction cavity of the micro sampling device.
2. The apparatus for micro pH detection of solution based on spectroscopic analysis according to claim 1, wherein: the diameters of the sampling channel and the optical path transmission channel are 1.8-2.5 mm.
3. The apparatus for micro pH detection of solution based on spectroscopic analysis according to claim 1, wherein: the light source is a halogen tungsten lamp.
4. The apparatus for micro pH detection of solution based on spectroscopic analysis according to claim 1, wherein: the controller adopts an AM3354 chip.
5. The apparatus for micro pH detection of solution based on spectroscopic analysis according to claim 1, wherein: the spectrometer is a USB2000+ spectrometer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920245159.8U CN209911216U (en) | 2019-02-27 | 2019-02-27 | Miniature solution pH detection device based on spectral analysis |
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| CN201920245159.8U CN209911216U (en) | 2019-02-27 | 2019-02-27 | Miniature solution pH detection device based on spectral analysis |
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| CN209911216U true CN209911216U (en) | 2020-01-07 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112748106A (en) * | 2021-02-01 | 2021-05-04 | 珠海市人民医院 | Acid-base detection system for endocrine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112748106A (en) * | 2021-02-01 | 2021-05-04 | 珠海市人民医院 | Acid-base detection system for endocrine |
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